well i have described this be4 but had no good answers. my truck is not shifting at the same point on the 1-2 shift. sometimes it shifts at 5600 then sometimes by the time it shifts it touches 6000. the 2-3 is round 5400 and it is fine. whats wrong with my baby? it seems to be losing some of the firmness it had also. any help would be apreciated. i only have a line mod valve in the trans.

 

If nobody here can help try NLOC.net and Gregg Evans in the Factory Tech area. (no plug for nloc just trying to help).

 

Sounds to me like the problem I use to have with my Line Valve Mod. DO you have that? If so yank that POS out and get a full Valve body.